Check-valve.



J. JOHNSON.

CHECK VALVE.

APPLICATION FILED 0014,1910.

1,004,654. 4 Patented 0013.3, 1911.

Jmf/razr (ii/ 25022,

Inventor Wit fies W a? r by Attorneys JONATHAN JOHNSON, 0F LOWELL,MASSACHUSETTS.

CHECK-VALVE.

Specification of Letters Patent.

Application filed October 4, 1910.

Patented Oct. 3, 1911.

Serial No. 585,279.

To all whom 'it may concern:

Be it known that I, JONATHAN J OHNSON, a citizen of the United States,residing at Lowell, in the county of Middlesex and State ofMassachusetts, have invented a new and useful Check-Valve, of which thefollowing is a specification.

This invention belongs to the art of valves, and it more especiallyrelates to a new and useful check valve, which may be utilized inconnection with the installation of water distribution, upon boilers andthe like.

The invention in its broadest aspect aims to provide a check valveincluding novel features of construction.

Another feature of the invention is to provide a gravitating member forclosing the valve, the same being open when under pressure.

Another object of the invention is the provision of means, whereby themovement of the valve may be varied, when the same is in the act ofbeing opened.

In the drawings, however, there is only disclosed one particular form ofthe invention, but in practical fields this form may require slightalterations, to which the applicant is entitled, provided thealterations are comprehended in the appended claims.

Other features and combinations of parts will hereinafter be set forth,shown in the drawings, and claimed.

In the drawings, Figure 1 is a side elevation of the check valve. Fig. 2is a vertical sectional view through the check valve, showing the valvein two different positions in dotted lines.

check valve is raised under pressure. This casingis provided with anannular flange 4:, which is provided with bolt receiving apertures 5,the purpose of which will presently appear. A cover or closure 6 isprovided for this casing, and is formed with a flange 7 corresponding inshape to the flange of the casing. This flange 7 is also perforated, asshown at 8. The apertures of the flanges of the cover or closure and thecasing, when brought into registration, receive the screw bolts 9, towhich are threaded the nuts 10. By the provision of the screw bolts 9and the nuts 10, as well as the apertures of the said flanges, the coveror closure is connected securely to the said casing.

Threaded into the cover or closure, is the sleeve 11, the largerexteriorly threaded portion 12 of which is threaded into the said coveror closure. The smaller exteriorly threaded portion 13, has threadedthereon the cap 14, the purpose of which will be hereinafter more fullyset forth. Projecting from the larger exterior-1y threaded portion 12 isa reduced portion 15, into which the stem 16 of the check valve 17extends, when the check valve is open when under pressure. When thecheck valve 17 is closed, the stem 16 only extends part way into thehollow portion of the reduced portion 15 of the sleeve. The check valve17 cooperates with the upper extremity of the short tubular pipe 18, thelower portion of which is threaded as at 19. This threaded portion 19 isconnected to the lower part of the said casing, as shown in Fig. 2 ofthe drawings. This hollow tubular member or pipe, when threaded into thecasing as shown in Fig. 2, nearly meets the end of the said elbow 1.However, there is a sufficient amount of space or clearance left betweenthe adjacent ends of the elbow and the tubular member or pipe 18, inorder to allow the tubular member or pipe to be slightly adjusted, inorder to vary the movement of the check valve 17. The method ofadjusting the tubular member or pipe 18 is only one way of varying themovement of the check valve. Another way for varying the movement of thecheck valve, consists in adjusting the cap 14:, between which and theupper end of the stem 16, a gravitating member or weight 20 is disposed.When the cap 14 is adjusted, it varies the space between the upper endof the stem 16 and the said cap, so that the gravitating member orweight 20 may have a smaller or greater space to move, when the checkvalve is raised under pressure. Under ordinary conditions, thisgravitating member or weight is of sulficient weight to hold the checkvalve in a closed position, but

escaping when the conditions become abnormal, the check valve 17 israised, and with it the gravitating member or weight 20. When rising,they are limited in their movements by the sleeve 14:. When the checkvalve 17 is raised, the fluid or air passes through the elbow and thetubular member or pipe 18, through the offset interiorly threadedportion of the casing. Thus the steam, hydraulic and air pressure mayescape to the atmosphere, or it may be con veyed to other devices.

It will be observed that the sleeve is provided with a flange 21, whichabuts against the upper outer face of the closure or to of the valvecasing.

From the above description, it will be.

noted that a novel and eflicient check valve is provided, and one whichwill act properly under ordinary conditions, by the use of thegravitating member or weight, but under abnormal conditions, the weightof the gravitating member is overcome, thus allowing of the sleeve andresting upon the upper end of the valve stem.

2. A valve comprising a conical casing having at its lower end an inletand an outlet in one wall thereof at right angles to the inlet, aremovable cover for the upper end of said casing, provided with acentral opening therethrough, a tubular member fitting within the casingand secured in the inlet end thereof, a removable sleeve mounted in theopening of the cover and provided with a central bore concentric withthe tubular member, a valve, resting upon the upper end of the tubularmember and having its cylindrical stem slidably mounted in the lower endof the bore of said sleeve, a cap mounted upon the outer extremity ofthe sleeve and closing the bore thereof, and a clyindrical weightslidably mounted in the bore of said sleeve above the stem of the valveand adapted to normally hold the valve closed, but to permit a verticalmovement due to the pressure in the tubular member.

In testimony that I claim the foregoing as my own, I have hereto affixedmy signature in the presence of two witnesses.

JONATHAN JOHNSON.

Witnesses:

ETHEL E. LIVINGSTON, HAVEN G. HILL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

